Negative short-term salt effects on the soybean-Bradyrhizobium japonicum interaction and partial reversion by calcium addition

作者：Munoz Nacira; Rodriguez Marianela; Robert German; Lascano Ramiro^*

来源：Functional Plant Biology, 2014, 41(1): 96-105.

DOI：10.1071/FP13085

• ionic homeostasis
• nodulation
• pathogenic-related proteins
• symbiotic interaction

The short-term (2h) effects of salt stress (50 and 150mM NaCl) on early events of soybean- Bradyrhizobium japonicum (rhizobia) interaction were analysed, determining the following parameters in root hair with or without calcium addition: deformation, apoplastic superoxide radical production (O-2?(-)), root hair death and sodium/potassium ion content. We also analysed whether this short-term salt stress influenced later formation of crown and noncrown nodules, determining the number and weight of nodules. The negative effect of salt stress on these characters was attenuated by the addition of 5mM CaCl2. We also analysed the expression of pathogenesis-related proteins (PRP) genes PR-1, PR-2, PR-3, and four isoforms of PR-5. The expression of PR-2 increased under saline conditions and decreased in osmotic treatment and saline treatment supplemented with calcium in the presence of the symbiont. The changes in PR-2 expression levels, together with the death of root hairs provide a possible mechanism for the inhibition of infection by the symbiont under salinity, and suggests a possible overlap with responses to plant pathogens.

• 出版日期2014